Liquid Crystal Display Warp Reduction via Optical Member Strain Control
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Solution Overview
Problem
Liquid crystal display devices experience nonuniform display due to warping caused by external environmental factors such as temperature and humidity, which existing solutions fail to adequately address without increasing material cost or thickness and compromising mechanical reliability.
Innovation Solution
The implementation of a liquid crystal display device design that includes a polarizing plate and a backlight device with optical members in intimate contact via an adhesive, where the strain per unit length on the optical members is minimized, and a low refractive index layer is used on the optical members with concavo-convex surfaces, along with a transparent layer to manage strain and bending moments, ensuring reduced warp without increasing device thickness or material cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal display portion is fixed by frame members with sufficient clearance to prevent contact during warp, then mechanical reliability is improved, but the liquid crystal display portion is not fixed and misalignment occurs
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the position of the liquid crystal display portion during assembly, specifically positioning it closer to the optical member group than in conventional designs. This preliminary positioning, combined with the warp reduction effect from the invention, enables the display portion to remain fixed without excessive clearance while avoiding contact during warp, thus achieving both mechanical reliability and alignment precision.
2Reliability
If frame members and optical member group are provided to fix the liquid crystal display portion, then mechanical reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of the frame members and optical member group by having the optical member group serve dual purposes: optical function and mechanical support function. The liquid crystal display portion is fixed to the optical member group, which already exists in the device, thereby achieving mechanical reliability without adding separate support structures and reducing overall device complexity.
3Adaptability or versatility
If the liquid crystal display portion is made larger to improve display quality, then display performance is improved, but warp becomes more obvious and mechanical reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the position parameter of the liquid crystal display portion during assembly, placing it closer to the optical member group. This parameter change, combined with the warp reduction mechanism, enables larger display portions to maintain mechanical reliability by reducing the relative impact of warp deformation on the overall device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces warp in the liquid crystal display portion across varying environmental conditions without increasing material cost or thickness, maintaining mechanical reliability and optimizing display performance.
Implementation Method 1
the optical member 1 is brought into intimate contact with the liquid crystal display portion via an adhesive
Implementation Method 2
a low refractive index layer is used on the optical members with concavo-convex surfaces
Data Source
AI summary
The liquid crystal display device capable of reducing warp includes a liquid crystal display portion (6) and a backlight device (10) provided on a side opposite to a display surface of the liquid crystal display portion (6). The liquid crystal display portion (6) includes polarizing plates (1) and (2) and the backlight device (10) includes N (N≧1) optical members. When the N optical members are denoted by reference numerals 1, 2, . . . , and N in the stated order from a side on which the liquid crystal display portion (6) is provided, the optical member 1 is brought into intimate contact with the liquid crystal display portion (6) via an adhesive, and strain per unit length on the optical member 1 at least one of −10 to 10° C. and 40 to 70° C. is ⅕ or smaller of strain per unit length on the polarizing plates (1) and (2).